But Demi fired back,
with a little help from a text message from her boyfriend, which Kutcher sent
her while she was on the show.

She said, "He has a message for you, too:
'Tell him I wanted to say, "Dude, where's your girlfriend?" I mean, how do you
keep it all so secret? You have the same girlfriend. How do you do it?"'
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Suddenly it was reclusive Letterman's turn to feel uncomfortable in being
asked about his romance with Regina Lasko. He mumbled, "Nobody cares. Why would
Ashton Kutcher care? I feel like I've been Punk'd," he mumbled,
referring to Kutcher's MTV show in which he plays pranks on celebrities.